It should pretty well wipe it out. Unless there are a few non-vectoring modems on user premises .

Didn't Plusnet say is wasn't as effective as they had hoped, I'm sure there is a thread about the trials on their forums.

Here's a four second recording of the sound.

Good luck with reporting that one !

I think you need to fully undo, temporarily at least, that botched master socket extension in order to see what effect it's having.

Brookzy had all that sorted out, the installation is now pukka.

Hi Zarjaz.

Is that the case (I may have missed the relevant posts)? I know the bridge tap was removed, but I thought the rest was left intact (ie extension from original master to new master via unknown cable, unknown length, crimped by someone now known to be incompetent, possibly with secondary wiring coming back in cores within the same cable, and a master socket supplied by this person also).

No back ending AFAIK, as he no longer uses the extension wiring.

Just to clarify, the current setup is as follows:

Drop wire ---> Internal wiring ---> Location of "old" master socket location ---> Jelly crimps ---> Internal wiring ---> Location of "new" master socket; all extensions isolated

The engineer saw and aknowledged this.

Yep, so just a single pair all the way in. As nature intended.

Well the strange thing is that the wire enters the premises on a blue pair, and arrives at the new master on an orange pair. So the crimps join the blue and orange pairs. Hopefully this isn't creating a slowdown.

I'm pretty sure I can say the lower than expected speeds are due to crosstalk.